Harry Connick

A man whose convictions on charges he killed five people at a 1995 party were overturned by the U.S. Supreme Court last year is suing the New Orleans district attorney's office.

The federal lawsuit filed Thursday on Juan Smith's behalf accuses prosecutors of concealing evidence from defense attorneys and lying to cover up their alleged misconduct.

Smith's suit seeks at least $24 million in damages. Former Orleans Parish District Attorney Harry Connick, whose office prosecuted Smith, and Leon Cannizzaro, the current district attorney, also are named as defendants.